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59706cdaa8
The HTML specification contains a number of algorithms which are quadratic in complexity by design. Instead of adding complicated workarounds to prevent these cases from becoming extremely expensive in pathological cases, we impose a limit of 512 to the size of the stack of open elements. It is extremely unlikely that non-adversarial HTML documents will ever hit this limit (but if we see cases of this, we may want to make the limit configurable via a ParseOption). Thanks to Guido Vranken and Jakub Ciolek for both independently reporting this issue. Fixes CVE-2025-47911 Fixes golang/go#75682 Change-Id: I890517b189af4ffbf427d25d3fde7ad7ec3509ad Reviewed-on: https://go-review.googlesource.com/c/net/+/709876 Reviewed-by: Damien Neil <dneil@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>